Do you know those acronyms that the author put? ENFP, ISTJ... This is part of a theory of psychological types created by Carl Jung and later developed by other scholars, but Jungian theory is the most... lenient (?I don't know if this is the right word lol). It's definitely a complex theory, so I understand a lot of people don't understand.
Of course! Just warning you again that it's a complicated theory so I recommend you to study hard if you're interested (you can start with the mbti notes tumblr site, but just for start, because the site is pretty superficial. check out Jung himself and Marie Von Franz later).
Just for an introduction: Jung said that our mind is divided into 4 functions that we use to think and solve problems, there are 8 but each person uses only 4, including: Introverted Thinking, Extraverted Thinking, Introverted Feeling, Extraverted Feeling, Introverted Intuition, Extroverted Intuition, Introverted Sensation and Extroverted Sensation. Feeling is about values that can be object-oriented (extrovert) or subjective-oriented (introverted). Thinking is the systematization of things, it can also be according to the object or the subjective. Sensation is about (in superficial words) the concreteness of things and intuition is about their abstraction. They can also be object or the subjective-oriented.
Using ENFP as an example, this person uses the functions: Dominant - Extraverted intuition, they sees in the outside world the abstract concepts and relates them to each other; Auxiliary Function - Feeling Introverted, they judges the world that they discovers from Intuition by inner values; the tertiary and the inferior are functions that work badly, in this case they would be: the tertiary Extraverted Thinking and the inferior Introverted Sensation. They are less developed because, according to Jung, they are functions that the brain has decided to ignore more. Anyway, this is a pretty superficial short explanation, but I hope it gave you some light
Of course! Just warning you again that it's a complicated theory so I recommend you to study hard if you're interested (you can start with the mbti notes tumblr site, but just for start, because the site is pretty superficial. check out Jung himself and Marie Von Franz later).
Just for an introduction: Jung said that our mind is divided into 4 functions that we use to think and solve problems, there are 8 but each person uses only 4, including: Introverted Thinking, Extraverted Thinking, Introverted Feeling, Extraverted Feeling, Introverted Intuition, Extroverted Intuition, Introverted Sensation and Extroverted Sensation. Feeling is about values that can be object-oriented (extrovert) or subjective-oriented (introverted). Thinking is the systematization of things, it can also be according to the object or the subjective. Sensation is about (in superficial words) the concreteness of things and intuition is about their abstraction. They can also be object or the subjective-oriented.
Using ENFP as an example, this person uses the functions: Dominant - Extraverted intuition, they sees in the outside world the abstract concepts and relates them to each other; Auxiliary Function - Feeling Introverted, they judges the world that they discovers from Intuition by inner values; the tertiary and the inferior are functions that work badly, in this case they would be: the tertiary Extraverted Thinking and the inferior Introverted Sensation. They are less developed because, according to Jung, they are functions that the brain has decided to ignore more. Anyway, this is a pretty superficial short explanation, but I hope it gave you some light

With all due respect to the author (I love youuu), but I study mbti theory and this is definitely not right (⊙…⊙ )